Received: 16 October 2020
Accepted: 31 May 2021
First Online: 17 June 2021
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Biomedical Ethics Committee of Xi'an Jiaotong University, approval number: 2014-0303) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from the immediate family members of the deceased for educational and scientific research purposes. The format of the informed consent form is in line with the guidelines of the China Organ Donation Administrative Center.
: Not applicable.
: The authors declare no competing interests..